你要做的就是确保花上足够的时间沉浸在外语学习之中，这是学好外语的最大保证。翻译

Answer 1

What you should do is to insure that you have spent enough time on English study--it`s the greatest guarantee of study English well.
以英语为例~
谢谢你给了我写英语句子的灵感~

Answer 2

What you need to do is to ensure that you spend enough time learning a foreign language, which is the greatest guarantee for foreign language learning.

Answer 3

You have to do is make sure spend enough time immersed in foreign language learning, this is the biggest guarantee to learn a foreign language.

Answer 4

What you should do is to insure that you have spent enough time on English study--it`s the greatest guarantee of study English well.

Answer 5

　　
　　你要做的就是确保花上足够的时间沉浸在外语学习之中，这是学好外语的最大保证。
　　What you need to do is to make sure that you spend enough time deeply in learning foreign languages, which is the most significant guarantee for foreign language learning.